Please put in oven temperature and baking time.

The baking time and temperature are both going to depend completely on the item you're putting your streusel on. A banana bread, for example, could be topped with streusel, but you'd want to follow the original instructions for baking the bread rather than instructions for baking the streusel. To bake the streusel on it's own, crumble it onto a parchment lined baking sheet and bake at 350 degrees Fahrenheit for 15-17 minutes. After the streusel cools, it should be fairly crisp, but you should be able to crumble it on top of whatever you're making.